base-plus-fog density

base-plus-fog density

[′bās ‚pləs ′fäg ‚den·səd·ē]
(optics)
The value of the inherent optical transmission density of a film base plus the nonimage density contributed by the developed emulsion.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.